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path: root/payloads/libpayload/drivers/pcie_mediatek.c
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Diffstat (limited to 'payloads/libpayload/drivers/pcie_mediatek.c')
-rw-r--r--payloads/libpayload/drivers/pcie_mediatek.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/pcie_mediatek.c b/payloads/libpayload/drivers/pcie_mediatek.c
new file mode 100644
index 0000000000..a953bd7fae
--- /dev/null
+++ b/payloads/libpayload/drivers/pcie_mediatek.c
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <libpayload.h>
+#include <pci.h>
+
+#define PCIE_CFGNUM_REG 0x140
+#define PCIE_CFG_DEVFN(devfn) ((devfn) & GENMASK(7, 0))
+#define PCIE_CFG_BUS(bus) (((bus) << 8) & GENMASK(15, 8))
+#define PCIE_CFG_OFFSET_ADDR 0x1000
+#define PCIE_CFG_HEADER(bus, devfn) \
+ (PCIE_CFG_BUS(bus) | PCIE_CFG_DEVFN(devfn))
+
+uintptr_t pci_map_bus(pcidev_t dev)
+{
+ u32 devfn = (PCI_SLOT(dev) << 3) | PCI_FUNC(dev);
+ u32 val = PCIE_CFG_HEADER(PCI_BUS(dev), devfn);
+ write32((void *)(lib_sysinfo.pcie_ctrl_base + PCIE_CFGNUM_REG), val);
+
+ return lib_sysinfo.pcie_ctrl_base + PCIE_CFG_OFFSET_ADDR;
+}